# A152350 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 24 5 120 6 720 7 4416 8 30744 9 230688 10 2001008 11 18030688 12 182144368 13 1950526752 14 22664810508 15 280110770684 16 3686769376452